JP4925134B2 - Stirrer stirring power control method - Google Patents

Stirrer stirring power control method Download PDF

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JP4925134B2
JP4925134B2 JP2008031711A JP2008031711A JP4925134B2 JP 4925134 B2 JP4925134 B2 JP 4925134B2 JP 2008031711 A JP2008031711 A JP 2008031711A JP 2008031711 A JP2008031711 A JP 2008031711A JP 4925134 B2 JP4925134 B2 JP 4925134B2
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stirring
liquid
power
inverter
unit power
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JP2009189923A (en
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尚志 住友
康宏 主濱
竜介 中田
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Izumi Food Machinery Co Ltd
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本発明は、攪拌機の攪拌動力制御方法に関し、特に、処理液の液粘度の変化に対して自動的に攪拌動力を制御するようにして、常に最適な攪拌動力で攪拌を行うことができるようにした攪拌機の攪拌動力制御方法に関するものである。   The present invention relates to a stirring power control method for a stirrer, and in particular, the stirring power is automatically controlled in response to a change in the liquid viscosity of the processing liquid so that stirring can always be performed with the optimum stirring power. The present invention relates to a stirring power control method for a stirrer.

従来、液の混合や溶解等を目的とした攪拌処理用の攪拌機では、攪拌中に液粘度が変化する場合、電動機への電流値を目視し、それに合わせて回転数を手動で変更しながら、攪拌動力を増加又は減少させていた。
その場合、液量変化や液粘度変化を同時に捉え、それにより最適な攪拌動力を求め、攪拌運転に連続的に適用することは難しい。
また、攪拌動力を複雑に変化させる必要がある場合、現状の方法では追随不可能である。 Conventionally, in a stirrer for stirring treatment for the purpose of mixing and dissolving liquids, when the liquid viscosity changes during stirring, visually check the current value to the motor and manually change the rotation speed accordingly, The stirring power was increased or decreased.
In that case, it is difficult to capture the change in the liquid amount and the change in the liquid viscosity at the same time, thereby obtaining the optimum stirring power, and to apply it continuously to the stirring operation.
Further, when it is necessary to change the stirring power in a complicated manner, it is impossible to follow the current method.

具体的には、例えば、図４に示すように、液粘度μが上昇するにつれて最適攪拌単位動力Ｐｖも上昇する。
一定速度で攪拌する場合、最大液粘度で攪拌が十分なように、運転終了までずっと最大の攪拌動力で攪拌を行うこととなる。 Specifically, for example, as shown in FIG. 4, as the liquid viscosity μ increases, the optimum stirring unit power Pv also increases.
In the case of stirring at a constant speed, stirring is performed with the maximum stirring power until the end of operation so that stirring is sufficient at the maximum liquid viscosity.

そのため、液が低粘度になったときには、攪拌動力が過大になって攪拌槽上部の気相を巻き込み、処理液が泡立つなどの問題が発生し、また、電力を無駄に消費する。
逆に、最小液粘度での最適な攪拌動力に合わせた場合、高液粘度のときに攪拌動力が不足し、液が攪拌できない、又は攪拌時間が長くなるという問題が発生する。
なお、手動で変速する場合は、攪拌工程における液粘度変化を読み取るために、計器盤を眺めながら攪拌中ずっとオペレータが攪拌速度を変更し続ける必要があり、液量や回転数等の要因から最適な攪拌回転数をオペレータが瞬時に判断することは難しく、また、液粘度が急激に変化する液についてはさらに困難が生じる。 For this reason, when the viscosity of the liquid becomes low, the stirring power becomes excessive and the gas phase above the stirring tank is entrained, causing problems such as the foaming of the processing liquid, and power is wasted.
On the other hand, when the optimum stirring power at the minimum liquid viscosity is used, there is a problem that the stirring power is insufficient when the liquid viscosity is high and the liquid cannot be stirred or the stirring time becomes long.
When shifting manually, the operator needs to continuously change the stirring speed while stirring while looking at the instrument panel in order to read the change in liquid viscosity in the stirring process. It is difficult for the operator to instantly determine a proper number of stirring revolutions, and it becomes more difficult for a liquid whose liquid viscosity changes abruptly.

本発明は、上記従来の攪拌機の攪拌動力制御方法が有する問題点に鑑み、処理液の液粘度の変化に対して自動的に攪拌動力を制御するようにして、常に最適な攪拌動力で攪拌を行うことができる攪拌機の攪拌動力制御方法を提供することを目的とする。   In view of the problems of the conventional stirring power control method of the stirrer, the present invention automatically controls the stirring power with respect to the change in the viscosity of the processing liquid, so that the stirring is always performed with the optimum stirring power. It aims at providing the stirring power control method of the stirrer which can be performed.

上記目的を達成するため、本発明の攪拌機の攪拌動力制御方法は、攪拌槽に配設した攪拌軸をモータで回転させることにより攪拌を行う攪拌機の攪拌動力制御方法であって、モータの回転数を調節するインバータと、インバータを制御する制御装置と、攪拌槽の液量を計測する液量計とを設け、攪拌槽の液量と、インバータの周波数、出力電流及び出力電圧とを測定することによりリアルタイムの攪拌単位動力と液粘度とを算出し、該算出した攪拌単位動力が、液粘度に対する最適攪拌単位動力のデータテーブルと該算出した液粘度とから導出される攪拌単位動力になるように、インバータの周波数を制御することを特徴とする。   In order to achieve the above object, the stirring power control method for a stirrer of the present invention is a stirring power control method for a stirrer that stirs by rotating a stirring shaft disposed in a stirring tank by a motor, and the number of rotations of the motor An inverter that controls the inverter, a control device that controls the inverter, and a liquid meter that measures the amount of liquid in the stirring tank, and measures the liquid amount in the stirring tank and the frequency, output current, and output voltage of the inverter To calculate the real-time stirring unit power and liquid viscosity so that the calculated stirring unit power is the stirring unit power derived from the optimal stirring unit power data table for the liquid viscosity and the calculated liquid viscosity. The frequency of the inverter is controlled.

この場合において、攪拌翼の種類に応じた複数の最適攪拌単位動力のデータテーブルを用いることができる。   In this case, a plurality of optimum stirring unit power data tables corresponding to the types of stirring blades can be used.

本発明の攪拌機の攪拌動力制御方法によれば、モータの回転数を調節するインバータと、インバータを制御する制御装置と、攪拌槽の液量を計測する液量計とを設け、攪拌槽の液量と、インバータの周波数、出力電流及び出力電圧とを測定することによりリアルタイムの攪拌単位動力と液粘度とを算出し、該算出した攪拌単位動力が、液粘度に対する最適攪拌単位動力のデータテーブルと該算出した液粘度とから導出される攪拌単位動力になるように、インバータの周波数を制御することから、攪拌動力の過不足をなくし、処理液の液粘度の変化に対して自動的に攪拌動力を制御するようにして、常に最適な攪拌動力で攪拌を行うことができる。   According to the stirring power control method for a stirrer of the present invention, an inverter that adjusts the number of rotations of a motor, a control device that controls the inverter, and a liquid meter that measures the amount of liquid in the stirring tank are provided. Real-time stirring unit power and liquid viscosity are calculated by measuring the amount, inverter frequency, output current and output voltage, and the calculated stirring unit power is a data table of optimum stirring unit power with respect to liquid viscosity; The frequency of the inverter is controlled so that the stirring unit power derived from the calculated liquid viscosity is obtained, so that the stirring power is not excessively insufficient and the stirring power is automatically adjusted with respect to the change in the liquid viscosity of the processing liquid. Thus, stirring can always be performed with the optimum stirring power.

この場合、攪拌翼の種類に応じた複数の最適攪拌単位動力のデータテーブルを用いることにより、複数種の攪拌翼においても最適な攪拌動力で攪拌を行うことができる。   In this case, by using a plurality of optimum stirring unit power data tables corresponding to the types of the stirring blades, it is possible to perform stirring with the optimum stirring power even with the plurality of types of stirring blades.

以下、本発明の攪拌機の攪拌動力制御方法の実施の形態を、図面に基づいて説明する。   Embodiments of the stirring power control method for a stirrer of the present invention will be described below with reference to the drawings.

図１〜図２に、本発明の攪拌機の攪拌動力制御方法の一実施例を示す。
攪拌機は、攪拌槽１に配設した攪拌軸２をモータ３で回転させることにより攪拌を行うもので、モータ３の回転数を調節するインバータ４と、インバータ４を制御する制御装置５と、攪拌槽１の液量を計測する液量計６とを備えている。
そして、本実施例の攪拌機の攪拌動力制御方法においては、攪拌槽１の液量と、インバータ４の周波数、出力電流及び出力電圧とを測定することによりリアルタイムの攪拌単位動力と液粘度とを算出し、算出した攪拌単位動力が、液粘度に対する最適攪拌単位動力のデータテーブルと算出した液粘度とから導出される攪拌単位動力になるように、インバータ４の周波数を制御するようにしている。
これにより、攪拌動力の過不足なく、処理液の液粘度の変化に対して自動的に攪拌動力を制御して、常に最適な攪拌動力（導出された攪拌単位動力と攪拌槽１の液量とから算出される攪拌動力（導出された攪拌単位動力×攪拌槽１の液量））で攪拌を行うことができる。 1 to 2 show an embodiment of the stirring power control method of the stirrer of the present invention.
The agitator performs agitation by rotating the agitation shaft 2 disposed in the agitation tank 1 with a motor 3, and includes an inverter 4 for adjusting the rotation speed of the motor 3, a control device 5 for controlling the inverter 4, an agitation A liquid meter 6 for measuring the liquid amount in the tank 1 is provided.
And in the stirring power control method of the stirrer of a present Example, real-time stirring unit power and liquid viscosity are calculated by measuring the liquid quantity of the stirring tank 1, the frequency of the inverter 4, an output current, and an output voltage. The frequency of the inverter 4 is controlled so that the calculated stirring unit power becomes the stirring unit power derived from the data table of the optimum stirring unit power with respect to the liquid viscosity and the calculated liquid viscosity.
Accordingly, the stirring power is automatically controlled with respect to the change in the viscosity of the processing liquid without excessive or insufficient stirring power, and the optimum stirring power (the derived stirring power and the amount of liquid in the stirring tank 1 are always determined). The stirring can be performed with the stirring power calculated from (the stirring unit power derived × the liquid amount in the stirring tank 1).

攪拌槽１は有底円筒状をなし、モータ３により回転する攪拌軸２を中心部に配設している。
また、攪拌槽１は、保温又は冷却ジャケット（図示省略）を周囲に設けたり、側壁や底壁を透明にしたりすることができ、かつ数十から数百リットルの様々な容量に形成することができる。 The stirring tank 1 has a bottomed cylindrical shape, and a stirring shaft 2 that is rotated by a motor 3 is disposed at the center.
Further, the stirring tank 1 can be provided with a heat insulation or cooling jacket (not shown) around it, the side walls and the bottom wall can be made transparent, and can be formed in various capacities of tens to hundreds of liters. it can.

攪拌軸２の下部には、攪拌槽１の底壁に近接するように、平板状のボトム翼７が溶接やボス接続により固定されている。
このボトム翼７は、その回転により攪拌槽１の側壁に向かう吐出流を生じ、この吐出流が転じた上昇流と、上昇流が液面で内向きに転じ、攪拌槽１の中心付近で下降する下降流とからなる循環流を発生させる。 A flat bottom blade 7 is fixed to the lower part of the stirring shaft 2 by welding or boss connection so as to be close to the bottom wall of the stirring tank 1.
The bottom blade 7 generates a discharge flow toward the side wall of the agitation tank 1 due to the rotation thereof, and the upward flow that the discharge flow turns and the upward flow turns inward at the liquid level and descends near the center of the stirring tank 1. A circulating flow consisting of a downward flow is generated.

一方、食品や化学業界の処理液は、攪拌中の加熱や冷却、攪拌時の剪断によって、攪拌途中で液粘度が変化するものが多い。
本実施例の攪拌機の攪拌動力制御方法は、この処理液の粘度の変化に合わせて攪拌動力を変更し、攪拌動力が過不足ないように運転することで最適の攪拌を行う。
具体的には、液粘度計やトルク計を使用せずに、液量計６の値と、インバータ４の周波数、、出力電流及び出力電圧とを測定することによりリアルタイムの攪拌単位動力と液粘度とを算出し、算出した攪拌単位動力が、液粘度に対する最適攪拌単位動力のデータテーブルと算出した液粘度とから導出される攪拌単位動力になるように、インバータ４の周波数を制御し、時間により変化する攪拌動力が最適な攪拌動力になるようにして攪拌を行うようにする。 On the other hand, many processing solutions in the food and chemical industries change in liquid viscosity during stirring due to heating and cooling during stirring and shearing during stirring.
In the stirring power control method of the stirrer of the present embodiment, optimal stirring is performed by changing the stirring power in accordance with the change in the viscosity of the treatment liquid and operating so that the stirring power is not excessive or insufficient.
Specifically, real-time stirring unit power and liquid viscosity can be obtained by measuring the value of the liquid level meter 6, the frequency of the inverter 4, the output current and the output voltage without using a liquid viscometer or torque meter. And the frequency of the inverter 4 is controlled so that the calculated stirring unit power becomes the stirring unit power derived from the data table of the optimum stirring unit power with respect to the liquid viscosity and the calculated liquid viscosity. Stirring is performed such that the changing stirring power becomes the optimal stirring power.

この場合、攪拌翼の種類に応じた複数の最適攪拌単位動力のデータテーブルを用意し、異なる種類の攪拌翼においても最適な攪拌動力で攪拌を行うようにすることができる。   In this case, a plurality of optimum stirring unit power data tables corresponding to the types of the stirring blades can be prepared, and stirring can be performed with the optimum stirring power even in different types of stirring blades.

ここで、インバータの周波数Ｎ、出力電流Ｉ、出力電圧Ｖ、液量Ｑ及び攪拌翼の翼径ｄより液粘度μを演算する方法は下記のとおりであり、実質的に制御運転する前に事前に計算する場合もある。
１．インバータの周波数Ｎ、出力電流Ｉ、出力電圧Ｖ及び液量Ｑを測定する。
２．攪拌動力計算Ｐ＝Ｉ・Ｖを行う。
３．攪拌動力数Ｎｐ＝Ｐ／（ρＮ３ｄ５）を計算する。
４．攪拌翼の形状に固有な攪拌動力数Ｎｐ＝ｆ（Ｒｅ）の関係（図３参照）より、攪拌レイノルズ数を逆算する。
５．攪拌レイノルズ数Ｒｅ＝Ｎｄ２ρ／μより、液粘度μを逆算する。
上記１．及び２．は、運転中リアルタイムで行う。
また、上記３．〜５．を運転前に計算してから運転を開始することもできる。なお、運転中に計算する場合は、図２のフロー図において、［液量Ｑを測定］と［液粘度μに対する最適攪拌単位動力Ｐｖのデータテーブルと比較］との間で行うようにする。
液粘度μに対する最適攪拌単位動力Ｐｖのデータテーブルは、処理液の液粘度μと最適攪拌単位動力Ｐｖとの関係より求めるようにする（図４参照）。
液粘度μに対する最適攪拌単位動力Ｐｖのデータテーブルは、運転前に計算してから運転を開始するようにする。 Here, the method for calculating the liquid viscosity μ from the inverter frequency N, output current I, output voltage V, liquid volume Q and blade diameter d of the stirring blade is as follows. In some cases, it is calculated.
1. The inverter frequency N, output current I, output voltage V and liquid volume Q are measured.
2. Stirring power calculation P = I · V is performed.
3. The stirring power number Np = P / (ρN 3 d 5 ) is calculated.
4). From the relationship of the stirring power number Np = f (Re) inherent to the shape of the stirring blade (see FIG. 3), the stirring Reynolds number is calculated backward.
5. The liquid viscosity μ is calculated backward from the stirring Reynolds number Re = Nd 2 ρ / μ.
Above 1. And 2. Is done in real time while driving.
In addition, the above 3. ~ 5. It is also possible to start driving after calculating before driving. In the case of calculation during operation, the calculation is performed between [Measure liquid amount Q] and [Compare with data table of optimum stirring unit power Pv for liquid viscosity μ] in the flowchart of FIG.
The data table of the optimum stirring unit power Pv with respect to the liquid viscosity μ is obtained from the relationship between the liquid viscosity μ of the treatment liquid and the optimum stirring unit power Pv (see FIG. 4).
The data table of the optimum stirring unit power Pv for the liquid viscosity μ is calculated before the operation, and then the operation is started.

ここで、液粘度μに対する最適攪拌単位動力Ｐｖのデータテーブルは、例えば、以下の方法で作成するようにする。
液粘度の異なる複数の処理液（試料）に対し攪拌実験を行い、最適攪拌状態の動力を求め、そのデータに基づいて液粘度μに対する最適攪拌単位動力Ｐｖのデータテーブルを作成する。
最適攪拌状態は、
（１）攪拌単位動力が大きい場合、攪拌渦の深さが大きくなり泡を巻き込んでしまうので、攪拌渦による泡の巻き込みがない状態とする必要がある。これにより、攪拌単位動力の最大値が規制される。
（２）攪拌単位動力が小さい場合、例えば、攪拌槽内の脱色反応が終了するまでの時間が長くなるため、脱色反応が終了するまでの時間が最も短くなる攪拌単位動力にする。
（３）無駄な攪拌動力を与えないように攪拌単位動力を極力小さくする。つまり、脱色反応が終了するまでの時間が同じで攪拌単位動力が大きい場合と、小さい場合とが存在すれば、小さい方を最適攪拌単位動力とする。
の３項目を考慮して、攪拌渦による泡の巻き込みがなく、脱色反応が終了するまでの時間が最も短い攪拌状態のうち、最小の攪拌単位動力となる攪拌状態を最適攪拌状態とする。
なお、上記（１）と（２）を満たす攪拌単位動力が１つの場合、（３）の判断を必要としない。 Here, the data table of the optimum stirring unit power Pv with respect to the liquid viscosity μ is created by the following method, for example.
An agitation experiment is performed on a plurality of treatment liquids (samples) having different liquid viscosities, the power in the optimum agitation state is obtained, and a data table of the optimum agitation unit power Pv for the liquid viscosity μ is created based on the data.
The optimal stirring state is
(1) When the stirring unit power is large, the stirring vortex becomes deep and entrains bubbles, so it is necessary to prevent the bubbles from being entrained by the stirring vortex. Thereby, the maximum value of the stirring unit power is regulated.
(2) When the stirring unit power is small, for example, since the time until the decoloring reaction in the stirring tank is completed becomes long, the stirring unit power is set so that the time until the decoloring reaction is completed is the shortest.
(3) Reduce the stirring unit power as much as possible so as not to give unnecessary stirring power. That is, if the time until the decolorization reaction is the same and the stirring unit power is large and the case where the stirring unit power is small, the smaller one is set as the optimum stirring unit power.
In consideration of these three items, the stirring state having the minimum stirring unit power among the stirring states in which the bubbles are not entrained by the stirring vortex and the time until the decolorization reaction is completed is set as the optimum stirring state.
When there is one stirring unit power that satisfies the above (1) and (2), the determination in (3) is not necessary.

かくして、本実施例の攪拌機の攪拌動力制御方法は、モータ３の回転数を調節するインバータ４と、インバータ４を制御する制御装置５と、攪拌槽１の液量を計測する液量計６とを設け、攪拌槽１の液量と、インバータ４の周波数、出力電流及び出力電圧とを測定することによりリアルタイムの攪拌単位動力と液粘度とを算出し、該算出した攪拌単位動力が、液粘度に対する最適攪拌単位動力のデータテーブルと該算出した液粘度とから導出される攪拌単位動力になるように、インバータ４の周波数を制御することから、攪拌動力の過不足をなくし、処理液の液粘度の変化に対して自動的に攪拌動力を制御するようにして、常に最適な攪拌動力で攪拌を行うことができる。
また、攪拌翼の種類に応じた複数の最適攪拌単位動力のデータテーブルを用いることにより、複数種の攪拌翼においても最適な攪拌動力で攪拌を行うことができる。 Thus, the stirring power control method of the stirrer of the present embodiment includes an inverter 4 that adjusts the number of rotations of the motor 3, a control device 5 that controls the inverter 4, and a liquid meter 6 that measures the liquid amount in the stirring tank 1. And calculating the real-time stirring unit power and liquid viscosity by measuring the amount of liquid in the stirring tank 1 and the frequency, output current, and output voltage of the inverter 4, and the calculated stirring unit power is the liquid viscosity. Since the frequency of the inverter 4 is controlled so that the stirring unit power derived from the data table of the optimum stirring unit power for the above and the calculated liquid viscosity is obtained, the excess and shortage of the stirring power is eliminated, and the liquid viscosity of the treatment liquid The stirring power can be controlled automatically with respect to the change of the above, so that the stirring can always be performed with the optimum stirring power.
Further, by using a plurality of optimum stirring unit power data tables corresponding to the types of the stirring blades, it is possible to perform the stirring with the optimum stirring power even in the plurality of types of stirring blades.

以上、本発明の攪拌機の攪拌動力制御方法について、その実施例に基づいて説明したが、本発明は上記実施例に記載した構成に限定されるものではなく、その趣旨を逸脱しない範囲において適宜その構成を変更することができる。   As mentioned above, although the stirring power control method of the stirrer of this invention was demonstrated based on the Example, this invention is not limited to the structure described in the said Example, In the range which does not deviate from the meaning, that The configuration can be changed.

本発明の攪拌機の攪拌動力制御方法は、処理液の液粘度の変化に対して自動的に攪拌動力を制御するようにして、常に最適な攪拌動力で攪拌を行えることから、例えば、量や液粘度が変化する液の攪拌自動最適化の用途に広く好適に用いることができる。   The stirring power control method of the stirrer of the present invention automatically controls the stirring power with respect to the change in the liquid viscosity of the processing liquid and can always perform stirring with the optimal stirring power. It can be used widely and suitably for the purpose of automatic stirring optimization of liquids with varying viscosity.

本発明の攪拌機の攪拌動力制御方法で使用する攪拌機の一実施例を示す構成図である。It is a block diagram which shows one Example of the stirrer used with the stirring power control method of the stirrer of this invention. 同攪拌機の攪拌動力制御方法の一実施例を示すフロー図である。It is a flowchart which shows one Example of the stirring power control method of the stirrer. 攪拌翼の攪拌動力数と攪拌レイノルズ数との関係の一例を示すグラフである。It is a graph which shows an example of the relationship between the stirring power number of a stirring blade, and stirring Reynolds number. 最適攪拌単位動力と処理液の液粘度との関係の一例を示すグラフである。It is a graph which shows an example of the relationship between the optimal stirring unit power and the liquid viscosity of a process liquid.

符号の説明Explanation of symbols

１ 攪拌槽
２ 攪拌軸
３ モータ
４ インバータ
５ 制御装置
６ 液量計
７ ボトム翼 1 Stirring tank 2 Stirring shaft 3 Motor 4 Inverter 5 Control device 6 Fluid meter 7 Bottom blade

Claims (2)

攪拌槽に配設した攪拌軸をモータで回転させることにより攪拌を行う攪拌機の攪拌動力制御方法であって、モータの回転数を調節するインバータと、インバータを制御する制御装置と、攪拌槽の液量を計測する液量計とを設け、攪拌槽の液量と、インバータの周波数、出力電流及び出力電圧とを測定することによりリアルタイムの攪拌単位動力と液粘度とを算出し、該算出した攪拌単位動力が、液粘度に対する最適攪拌単位動力のデータテーブルと該算出した液粘度とから導出される攪拌単位動力になるように、インバータの周波数を制御することを特徴とする攪拌機の攪拌動力制御方法。   A stirring power control method for a stirrer that stirs by rotating a stirring shaft disposed in a stirring tank with a motor, an inverter that adjusts the number of rotations of the motor, a control device that controls the inverter, and a liquid in the stirring tank A liquid meter for measuring the volume is provided, and the real-time stirring unit power and liquid viscosity are calculated by measuring the liquid volume in the stirring tank and the frequency, output current and output voltage of the inverter, and the calculated stirring Agitator power control method for an agitator, characterized in that the frequency of the inverter is controlled so that the unit power becomes a stirring unit power derived from the data table of the optimum stirring unit power for the liquid viscosity and the calculated liquid viscosity . 攪拌翼の種類に応じた複数の最適攪拌単位動力のデータテーブルを用いることを特徴とする請求項１記載の攪拌機の攪拌動力制御方法。   2. The stirring power control method for a stirrer according to claim 1, wherein a data table of a plurality of optimum stirring unit powers corresponding to the types of stirring blades is used.
JP2008031711A 2008-02-13 2008-02-13 Stirrer stirring power control method Expired - Fee Related JP4925134B2 (en)

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